A home is heated with a natural gas furnace sized 40,000Btu/hr. How many pounds of CO2 are produced in 24hours?

A home is heated with a natural gas furnace sized 40,000Btu/hr. How many pounds of CO2 are produced in 24hours? What is the cost/day. If the house is a square of 2500 sq. ft. floor space and the outdoor temperature is 30F, what is the R-value of the walls? Is this value reasonable?